Rotary cylinder abrading tool



Feb. 14, 1950 E. w. HALL ROTARY CYLINDER ABRADING TOOL File ontA 5, 1944 2 sheets-sheet 1 INVENTOR. E 1)@71 a WHaZ/ BY iw, fZZ, JMA., W r b-- Feb. 1% 1950 E. w. HALL.

ROTARY CYLINDER AABRADING TOOL 2 Sheets-Sheet 2 Patented Feb. 14, 1950 UNITED STATES 'f' PATENT OFFICE ,y l 2,497,497 ROTARY CYLINDEn ABRADING Tool. Elisha. W. Haul' scattate, Mass. Application ctober 3, 1944, Serial No. 556,928

1o clams.. (cl. 51.-1593) This invention relates to rotary 4cylinder abracl. lng tools and more particularly wheel sections -i-ntended to be assembled coaxially -on an arbor. The invention is concerned vwith a novel and improved construction involving a ring vof abrading ,fsmaterial composed of annular layers of cotton cloth for example, and -a hub composed of disks of fibrous material such as paper or .chipboaid the disks being alternately large and small in diameter and arranged coaxially Awith the outer jlb margins of the larger disks overlying and em-r bracing the inner margins of the annular layers of abrading material, the whole being bonded to. gether by a suitable bonding material such `as a resinous substance with which the disks are imin pregnated.

The invention will be understood by .reference to the following description when taken in connection with the accompanying drawings of one specific embodiment thereof, while its scope will a0 be pointed out more particularly in the appende claims. n

In the drawings:

Fig. 1 is an elevation of .an abrading tool embodying the invention; 25

Fig. 2 is a sectional view on an enlarged scale on line 2-2 of Fig. 1; v

Fig. 3 is a perspective view of the several disks which are to form the hub; l

Fig. 4 is a perspective view of the helical strip 39 of laminated, ruilled, bias-cut cloth to be assembled with the disks; and y Fig. 5 is a vertical sectional view illustrating the start of the assembling operation.

Referring to the drawings and to the embodi- 35 ment of the invention illustrated therein by way of example, there is shown a Wheel section comprising generally a ring 6 of abrading material such as cotton cloth and a hub 8 of 10W-cost material such as `paper or chipboard. In this ex- .4t ample, the cloth ring is composed of several lay# ers, and the hub likewise Iis composed of several layers some of which are interleaved with the layers of the ring in a manner presently to bel described.

In the present example, the layers of thering, instead of being sepa-rate and distinct pieces, which they might well be, are in the nature of one inherently helicoidal strip of indefinite length which is -cut to the required length during assembly with the disks which are to constitute the hub. In the present example, 4this long strip is composed of several thicknesses (three, yfor example) of bias-.cut cotton cloth ruied to form pleats and preferably stitched together by cir- ,d5

cular rows I0 of stitching to unite them into a composite strip l2 which is relatively compact along its inner margin and relatively loose along itsouter margin.

Heretofore, it has been common to make a wheel section hub of a single piece of chipboard of considerable thickness and to unite it with the cloth ring in various Ways which did not resuit in a structure possessing much strength. This disadvantage is overcome by the novel construction, now to be described, which possesses enormous strength. In this construction, the hub, insteadof being made as a single piece of considerable thickness, as heretofore, is composed of several laminae (see Fig. 2) in the nature of disks, namely, a set of relatively large disks I4 and a set of relatively small disks I6, the larger disks alternating with the smaller disks, thus providing annular spaces I8 which receive the layers of the cloth ring.

In other words, there is a set of layer-s of abrading material andra set of layers of material constituting the hub, one set of layers of the hub (the larger disks) being interleaved with the layers of abrading material. More specifically, the innerfmargins of the cloth layers are embraced by the outer margins of the larger disks and the inner edges of the cloth layers abut against the outer edges of the smaller disks.

By reference to Fig. 3, it will be observed that each of the large disks i4, except the two outer disks, is provided lwith a radial slit i8 (a notch might serveequally well) through which the inner margin of the helicoidal, composite strip l2 is passed during the operation of assembling the parts as hereinafter explained. Those portions of the disk adjacent to the slit will liex to accommodate the inner margin of the strip. Elach disk is preferably provided with `a central hole to receive a mandrel.

In preparation for the assembling and bonding, the `disks are treated with an appropriate resinous substance such as the one presently to be described, although there are perhaps as vrnany asa dozen different synthetic resins which can be employed. One which is found to be highly successful is a commercially obtainable liquid resin of the phenol formaldehyde type, known by .the trade name Resinox 468.

In accordance with the preferred procedure, the chipboard disks are impregnated with the Resinox reduced by the addition .of water to the amount of 50%, applied tothe disks as by dipping them in the solution or brushing the solution upon them. .The disks are .allowed .to dry 3 for approximately twenty-four hours under -average room conditions and they then possess the requisite degree of tackiness for assembly.

The operation of assembling (see Fig. 5) is facilitated by providing a base 2|) with an upright mandrel 22 to enter the holes in the disks and to register them properly. First, a large disk I4, one without a slit, is dropped upon and about the mandrel and laid upon the base, and a small disk I6 is laid upon the large disk. Then one end of the helicoidal strip I2 is laid with its inner margin upon the large disk I4 and with its inner edge against the outer edge of the small disk I5 and the strip is wound about the entire circumference of the small disk. Next, a second large disk I4, this one with a slit I8, is dropped upon and about the mandrel and is sprung sufficiently to enable the inner margin of the strip .I8 to be passed through the slit, whereupon this disk is dropped upon the'small disk. The assembly proceeds in this fashion until completed with a large disk, without a slit on the top of the pile. The strip I8 is then cut at the proper point so that there will be just one convolution about the uppermost small disk. The assembly is now in readiness for the application of heat and pressure in a mold or die. This mold should be provided with annular ribs, upper and lower, to exert a strong pressure near the margins of the larger disks, thus actually thinning the assembly at 24, 24 and making the same so compact at that point that outward flow of the bonding substance beyond the compressed area is prevented. Furthermore this compacting actually thins the margins of the large disks (see Fig. 2) and prevents any undue thickness of the assembly at that point.

Having thus described one embodiment of the invention, what I claim is:

1. In a rotary cyinder abrading tool, the combination of a helicoidal strip of abrading material, and a set of disks, alternately large and small, arranged coaxially face to face, the largedisks having openings extending inwardly from their peripheries, the margins of the large disks being separated by spaces about the margins ofthe small disks, and said strip occupying said spaces and extending serially from space to space through said openings.

2. In a rotary cylinder abrading tool, the combination of a helicoidal strip of abrading material, and a set of disks, alternately large and small, arranged coaxially face to face, the large disks having openings extending inwardly from their peripheries, the margins of the large disks being separated by spaces about the margins of the small disks, and said strip occupying said spaces and extending serially from space to space through said openings, the entire assembly being bonded together by a bonding material in the nature of a plastic.

3. In a rotary cylinder abrading tool, the combination of a helicoidal strip of abrading material, and a set of disks, alternately large and small, arranged coaxially face to face,-the large disks having openings extending inwardly from their peripheries, the` margins of the large disks being separated by spaces about the margins of the small disks, and said strip occupying said spaces and extending serially from space to space through said openings, the entire assembly being bonded together by a bonding material in the nature of a thermosetting resin.

4. In a rotary cylinder abrading tool, the combination of a helicoidal strip of abrading lmate-'- rial, and a set of disks, alternately large and small, arranged coaxially face to face, the large disks having openings extending inwardly from their peripheries, the margins of the large disks being separated by spaces about the margins of the small disks, and said strip occupying said spaces and extending serially from space to space through said openings, said disks being impregnated with a bonding material which bonds the disks together and to said strip. `V

5. In a rotary cylinder abrading tool,the combination of a helicoidal strip of abrading material, and a set of disks, alternately large and small, arranged coaxially face to face, the large disks having openings extending inwardly from their peripheries, the margins of the large disks being separated by spaces about the margins of the small disks, and said strip occupying said spaces and extending serially from space to space through said openings, said disks being impregnated with a bonding material in the nature of thermosetting resin which bondsthe disks to= gether and to said strip. 6. A bufng wheel comprising a strip of textile material wound in the form of a spiral, a fabric sheet having a slit positioned between two convolutions of said textile material, said textile material 'extending through said slit, and means for securing said textile material to said fabric sheet:

'7. Abuiling wheel `comprising a strip of textile material wound in the' form of a spiral, a plurality of fabric discs each having a substantially radially extending slit and positioned between several convolutions of said textile material, said textile material extending through each of said slits, and means for securing said textile material to said fabric discs.r i 8. A buffng wheel comprising a strip of textile material wound in the form of a spiral to provide a ring having a substantially ycircular open-rA ing, a plurality of fabric discs positioned within said opening having a diameter greater than said opening and extending around their peripheral edges for a substantial distance, between the several convolutions of said textile materiaheach of said fabric discs having a substantially radially extending slit from the outer periphery thereof to said opening, said textile material extending through each of said slits, and means for securingsaid textile material to said fabric discs.

9. A buling wheel comprising a strip of textile material wound in the` form of a flat spiral to provide a ring. having a substantially circular opening, said strip being gathered along the inner edge adjacent said opening, a plurality of fabric discs positioned within said opening each having a diameter greater than said opening but less than-the outside diameter of said ring, each of said fabric discs extending for a substantial'dis--l tance between the several convolutions of said textile material and having a substantially radial slit extending from `the outer periphery to said opening, said textile material extending through each of said slits, a plurality of separator discs within saidopening positioned between said fabric discs, andmeans for securing said textile material, said fabric discs and said separator discs in assembled relationship. v 10. A buffing wheel comprising a strip of textile material Wound'in the form of a spiral to provide a ring having a substantially `circular opening, a plurality of fabric sheets positioned within said opening having their peripheral edges extending between the several convolutions `of said textile 5 material, each of said fabric sheets having a. discontinuity in an edge thereof extending inwardly to the outer peripheral edge of said opening, said textile material extending through each of said discontinuities, and means for securing said textile material to said fabric sheets.

ELISHA W. HALL.

REFERENCES CITED The following references are of record in the file of this patent:

6 UNITED STATES PATENTS Number Name Date Poole Mar. 20, 1877 Keighley Apr. 16, 1895 Demmler Dec. 20, 1898 Levett Mar. 25, 1919 Wilkinson Oct. 9, 1934 Hall Jan. 14, 1936 Hall Mar. 17, 1936 Hargy Apr. 16, 1940 Melton et a1 Aug. 15, 1944 

